knitr::opts_chunk$set( collapse = TRUE, comment = "#>" )
library(lcsm) library(lavaan)
The main underlying functions to extract parameters and fit statistics come from the broom
package: broom::tidy()
and broom::glance()
.
The functions extract_param()
and extract_fit()
offer some tools that I find helpful when running LCSMs in R, for example:
extract_param()
: only one row per estimated parameter,extract_fit()
: fit statistics for multiple lavaan
objects can be extracted.# First fit some latent change score models # No change model uni_lcsm_01 <- fit_uni_lcsm(data = data_uni_lcsm, var = c("x1", "x2", "x3", "x4", "x5"), model = list(alpha_constant = FALSE, beta = FALSE, phi = FALSE)) # Constant change only model uni_lcsm_02 <- fit_uni_lcsm(data = data_uni_lcsm, var = c("x1", "x2", "x3", "x4", "x5"), model = list(alpha_constant = TRUE, beta = FALSE, phi = FALSE)) # Constant change and proportional change (Dual change model) uni_lcsm_03 <- fit_uni_lcsm(data = data_uni_lcsm, var = c("x1", "x2", "x3", "x4", "x5"), model = list(alpha_constant = TRUE, beta = TRUE, phi = FALSE))
This function takes the lavaan
objects as input and returns some fit statistics.
More fit statistics can be returned using the argument details = TRUE
.
# Extract fit statistics fit_uni_lcsm <- extract_fit(uni_lcsm_01, uni_lcsm_02, uni_lcsm_03) # Print table of parameter estimates knitr::kable(fit_uni_lcsm, digits = 3, caption = "Parameter estimates for bivariate LCSM")
# Now extract parameter estimates param_uni_lcsm_02 <- extract_param(uni_lcsm_03, printp = TRUE) # Print table of parameter estimates knitr::kable(param_uni_lcsm_02, digits = 3, caption = "Parameter estimates for bivariate LCSM")
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